Insights from active surface theory for engineering division in synthetic cells

GAO Da; MA Rui

doi:10.12211/2096-8280.2026-083

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Insights from active surface theory for engineering division in synthetic cells

更新时间：2026-09-17

- Insights from active surface theory for engineering division in synthetic cells
- 活性曲面理论对构建人工合成细胞分裂的启示
- Synthetic Biology Journal Pages: 1-13(2026)
- 作者机构：
  
  1.厦门大学物理科学与技术学院，福建　厦门　361005
  2.厦门大学物理科学与技术学院，福建省柔性功能材料重点实验室，福建　厦门　361005
- 作者简介：
  
  ruima@xmu.edu.cn
- 基金信息：
- DOI：10.12211/2096-8280.2026-083
  CLC： Q819;Q66
- Online First：17 September 2026，
- 稿件说明：
移动端阅览
高达，马锐. 活性曲面理论对构建人工合成细胞分裂的启示［J］. 合成生物学， 2026， 7. DOI： 10.12211/2096-8280.2026-083

GAO Da， MA Rui. Insights from active surface theory for engineering division in synthetic cells［J］. Synthetic Biology Journal， 2026， 7. DOI： 10.12211/2096-8280.2026-083
高达，马锐. 活性曲面理论对构建人工合成细胞分裂的启示［J］. 合成生物学， 2026， 7. DOI： 10.12211/2096-8280.2026-083 DOI：

GAO Da， MA Rui. Insights from active surface theory for engineering division in synthetic cells［J］. Synthetic Biology Journal， 2026， 7. DOI： 10.12211/2096-8280.2026-083 DOI：

摘要

自下而上构建能够分裂的人工合成细胞，是合成生物学迈向最小生命体系的关键一步。现有的分裂模块重构在收缩环的组装、中位定位与收缩起始上已取得显著进展，具有模块化、可控性强的优点，但在把收缩持续推进至细颈乃至完成膜断裂这一步上长期受阻，且缺乏一个能在实验之前判断形变会持续放大还是弛豫回复的介观判据，参数优化因而仍多依赖试错。活性曲面理论把细胞表面处理为一层由化学反应驱动、既可流动又可弯曲的活性薄层，借助力与力矩平衡、受 Onsager 互易关系约束的本构关系，以及分子马达浓度、主动张力、表面流动与几何之间的机械化学反馈，提供了一类可检验的稳定性判据。提出的核心观点是：活性曲面理论不是对模块化重构路线的替代，而是为其补充一个介观层次的组织原则——在给定膜面积、体积、耗散通道与断裂机制等约束下，判断所重构的活性层能否进入使分裂环形成并持续收颈的动力学区域。据此把环形成与收颈表述为受取向组织、耗散尺度与组分动力学共同控制的机械化学失稳，并给出两项最强的设计启示：在所讨论的向列活性曲面模型中，细丝的取向有序程度而非收缩应力的绝对大小决定赤道模式能否失稳，过强的各向同性收缩还可能通过压制向列序而抑制该模式；囊泡半径与流体动力学屏蔽长度之比则构成一个独立于细丝固有曲率的动力学尺度匹配条件。指出近期 FtsZ–cytoFtsN 实验的结果与这一图景相符：提高细丝取向有序度、延长聚合体寿命确实有利于大尺度收缩；但 cytoFtsN 依靠的是电荷介导的束化与动力学稳定化，与理论中的主动排列并非同一机制，因此这种相符仅是现象上的，尚不能视为对主动排列本构系数的直接验证。分析表明，特定模型还预言收颈可呈现多稳态与滞后，可通过控制参量的双向扫描检验。最后指出该框架目前只描述连续形变，完整分裂仍需同时解决膜面积储备与拓扑断裂机制，并就参数标定与理论–实验定量闭环提出了建议。

Abstract

Building a synthetic cell capable of division is a decisive step for bottom-up synthetic biology on its way towards a minimal living system. Reconstitution of division modules has made substantial progress in assembling contractile rings

placing them at mid-cell and initiating ingression

and this modular route has the clear advantage of being controllable and experimentally tractable. It has

however

repeatedly stalled at the step that matters most: sustaining ingression down to a thin neck and completing membrane scission. What is missing is a mesoscale criterion for deciding

before an experiment is run

whether a deformation will keep amplifying or relax back

which leaves parameter optimization largely empirical. Active surface theory offers a class of testable stability criteria of this kind. It treats the cell surface as a thin active layer driven by chemical reactions

which flows in plane and bends out of plane

and closes the description with force and torque balance

constitutive laws constrained by Onsager reciprocal relations

and a mechanochemical feedback loop coupling regulator concentration

active tension

surface flow and geometry. The central proposition advanced here is that active surface theory is not a replacement for the modular reconstitution route but a mesoscale organizing principle added to it: given the constraints set by membrane area

volume

dissipation channels and scission mechanism

it asks whether the reconstituted active layer can enter the dynamical regime in which a division ring forms and ingression is sustained. Ring formation and ingression are accordingly framed as a mechanochemical instability controlled jointly by orientational organization

dissipation length scales and component dynamics. Two design implications are emphasized: within the nematic active surface model discussed here

the degree of filament orientational order

rather than the absolute magnitude of contractile stress

governs whether the equatorial mode becomes unstable

and excessively strong isotropic contractility may further suppress that mode by destroying nematic order; and the ratio of vesicle radius to hydrodynamic screening length constitutes a dynamical scale-matching condition independent of the intrinsic curvature of the filaments. Recent FtsZ-cytoFtsN experiments are consistent with this picture at the mesoscale level: higher filament order and longer polymer lifetime favour large-scale constriction. Because cytoFtsN acts mainly through charge-mediated bundling and kinetic stabilization

however

this cannot yet be regarded as direct validation of the active alignment coefficient. Specific models further predict multistability and hysteresis during ingression

which can be tested by bidirectional sweeps of a control parameter. Because the framework describes continuous deformation only

complete division additionally requires an adequate membrane area reserve and a dedicated scission mechanism. Suggestions are made for parameter calibration and for closing a quantitative loop between theory and reconstitution.

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